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Componds (A) and B are treated with dilu...

Componds `(A)` and `B` are treated with dilute `HCl` separately. The gases liberated are `Y` and `Z` respectively. `Y` turns acidified `K_2 Cr_2 O_7` paper green while `Z` turns lead acetate paper black. The compounds `A` and `B` are respectively :

A

`Na_(2)S " and " Na_(2)SO_(3)`

B

`Na_(2)SO_(3) " and " Na_(2)S`

C

`NaCl " and" Na_(2)CO_(3)`

D

`Na_(2)SO_(3) " and " na_(2)SO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset((A))Na_(2)SO_(3)+2HCl (aq) to 2NaCl+H_(2)O+underset((X))SO_(2)`
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4) + underset((X))3SO_(2) to underset(("Green"))(Cr_(2)(SO_(4))_(3))+K_(2)SO_(4)+H_(2)O`
`underset((B))(Na_(2)S)+HCl(aq) to 2NaCl+underset((Y))(H_(2)S)`
`underset((Y))(H_(2)S)+Pb(CH_(3)COO)_(2) to underset(("Black"))(PbS+2CH_(3))COOH`
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